Effects of coil configuration switching, pole-changing and multi-phase windings on permanent magnet synchronous motors

This contribution suggests an approach to determine the optimal design of a Permanent Magnet Synchronous Motor for a given application by calculating the effects of coil configuration switching, pole-changing and multi-phase windings. The impact on the torque-speed-characteristic of a motor is evaluated in a normalized parameter plane, enabling the designer to compare the influences by using criteria like the operating range. Moreover, a way of assessing additional semiconductors is introduced. The effects on an exemplary design are presented in a unified approach. Due to this, promising designs for the example can be identified, which double the reachable torquespeed area to nearly ideal values.